Methods of determining cation exchange sites in rock core samples
US11300494B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 27, 2020 |
| Grant date | Apr 12, 2022 |
| Priority date | — |
| Expiry date | Jun 23, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/241
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for determining properties of different cation exchange sites in a rock core sample may include providing a rock core sample that is in either a preserved state or a non-preserved state, wherein a preserved form of the rock core sample includes a plurality of indigenous exchangeable cations adsorbed onto the cation exchange sites, a plurality of cation exchange sites occupied by a crude oil, and one or more fluids occupying pore spaces in the rock core sample; subjecting the rock core sample to a plurality of coreflooding steps, the plurality of coreflooding step displacing the plurality of indigenous exchangeable cations and the one or more fluids in at least two separate coreflooding steps to render the rock core sample clean of indigenous exchangeable cations; and determining an amount of indigenous exchangeable cations adsorbed onto the cation exchange sites.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.